Trace fossils from arenig flysch sediments of eire and their bearing on the early colonisation of the deep seas

Crimes, Tp; García-Hidalgo, José Francisco; Poiré, Daniel Gustavo

doi:10.1080/10420949209380076

Cited by 49 publications

(22 citation statements)

References 28 publications

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“…The ichnogenus ranges from the Lower Ordovician (Crimes et al, 1992) to the Eocene (Ksiazkiewicz, 1977). Remarks: This trace was probably formed as a spiral burrow around an approximately horizontal straight axis, Material: Specimen 6048E intersecting the sole of the bed only at the base of its spiral Description: Preserved in positive relief on sandstone (cf.…”

Section: Ichnogenus Glockerichnus Pickerill 1982mentioning

confidence: 99%

A diverse ichnofauna from Eocene‐Miocene rocks of the Makran Range (S.E. Iran)

Crimes

McCall²

1995

Ichnos

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A diverse assemblage of trace fossils has been collected from Lower Eocene to Upper Miocene strata during regional geological mapping of 75,000 km 2 of the Makran Range of southeastern Iran. Almost all are excellently preserved and this allows detailed descriptions, which in some cases can be used as a basis for taxonomic revisions of much used but inadequately analysed ichnogenera. 27 ichnogenera have been identified and 25 ichnospecies described. These ichnotaxa include forms which are: straight, unbranched (Planolites), straight, unbranched but twisted around a horizontal axis (Helicorhaphe), straight, branched (Chondrites, Palaeophycus, Thalassinoides), winding unbranched (Scolicia, Subphyllochorda, Taphrhelminthopsis), meandering or winding branched (Acanthorphaphe), spirals (Spirorhaphe, Spirophycus), networks (Desmograpton, Megagrapton, Paleodictyon, Urohelminthoida), rosettes (Glockerichnus, Lorenzinia) and spreite (Phycosiphon). There are also pellet lined burrows (Ophiomorpha) and rare unbranched vertical burrows (Skolithos).Descriptions are given of some 25 ichnospecies but three ichnogenera (Nereites, Paleodictyon, Urohelminthoida), are subjected to more detailed treatment, with taxonomic revision. All examples of Nereites with a sinuous or winding habit are placed in N. jacksoni Emmons 1844, to separate them from those with tight meanders and spirals for which N. cambrensis Murchison 1839 and N. macleayii Murchison 1839 are available. 6 ichnospecies of Paleodictyon are described and it is recognised that there is considerable gradation in mesh and string size, with significant overlap in the dimensions of these parameters between some ichnospecies where they are used as the main or sole diagnostic criteria. Consequently, the diagnosis of P. carpathicum (Matyasovsky, 1878) is emended to include all regular equidimensional to elongate hexagonal meshes with maximum length 3-10 mm and string diameter 0.1-2.5 mm. As a result, some examples of the following are placed in synonomy with it: P. majus Meneghini 1879, P. miocenicum Sacco 1886, P. regulare Sacco 1886, Glenodictyon caucasicum Papp 1910, P. chattoni Pugin 1955 and P. carpaticum Vialov and Golev 1964. A detailed analysis shows no consistent difference between Urohelminthoida appendiculata (Heer 1877) and U. dertonensis Sacco 1888, so they are united under the former, which has priority, and an emended diagnosis is given.The sequences containing the trace fossils occur in a series of tectonic slices bounded by reverse faults. Stratigraphic position and correlation between these slices is based on detailed paleontological and, more particularly, micropaleontological determinations.The oldest sequence, comprising the Zaboli Unit is Eocene in age and shows a transition from trace fossil barren shelf carbonates to deep water turbidite sandstones and shales containing: Acanthorhaphe, Desmograpton, Helminthoida, Lorenzinia, Paleodictyon, Spirophycus, Spirorhaphe, Taphrhelminthopsis and Urohelminthoida. The Darban, Mosri, Shirinzad, Ruk, Angohran and Shahr...

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Section: Ichnogenus Glockerichnus Pickerill 1982mentioning

confidence: 99%

A diverse ichnofauna from Eocene‐Miocene rocks of the Makran Range (S.E. Iran)

Crimes

McCall²

1995

Ichnos

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“…Material described and figured as Bifasciculus radiatus by Crimes & Crossley (1968, pis XD, XIA) and Crimes (1970, pi. la) was referred to Glockerichnus glockeri, (Ksiazkiewicz, 1968) by Crimes, Garcia Hidalgo & Poire (1992;fig. 2B-D).…”

Section: X24561 _ _ 2 0 M Mmentioning

confidence: 99%

The ichnofauna of the Skiddaw Group (early Ordovician) of the Lake District, England

Orr

1996

Geol. Mag.

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Deep-marine strata of the Skiddaw Group, deposited in high southerly palaeolatitudes on the northern margin of Eastern Avalonia in the early Ordovician, contain a diverse ichnofauna dominated by examples of fodinichnia. This includes Alcyonidiopsis pharmaceus, several ichnospecies of Chondrites, Dictyodora zimmermani, Glockerichnus radiatus, Gordia marina, Ixalichnus enodius, two or possibly three ichnospecies of Phycodes, Planolites montanus, Volkichnium volki, an ‘arthropod-produced? repichnion’, ‘paired pits’, ?Gordia aff. marina, ‘thinly-walled, looping, burrows’ and burrows of Planolites/Palaeophycus affinity. Stellascolites radiatus Etheridge, 1876 is reassigned to the ichnogenus Glockerichnus Pickerill, 1982 as Glockerichnus radiatus (Etheridge, 1876).Several of the ichnotaxa are present in other ichnofaunal assemblages of early Ordovician age which were also emplaced at high southerly palaeolatitudes. The relatively high diversity of this ichnofaunal assemblage supports suggestions that models of the rate at which the deep-marine environment was colonized during the early Phanerozoic are in need of revision.

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“…This includes the report (Gingras et al, 2011) of the large starshaped trace fossil Lorenzinia appeninica. The oldest Lorenzinia specimens have been thought to appear in the Arenig Seamount formation of Ireland (Crimes et al, 1992). Uchman (1998, p. 133) suggested that Phycodes coronatus from Member 2 of the Chapel Island Formation of Newfoundland (Crimes and Anderson, 1985) could be a "primitive" Lorenzinia, but Phycodes coronatus is better explained as a Treptichnus pedum-type burrow.…”

Section: Age Of the Goldenville Groupmentioning

confidence: 99%

Cambrian-Ordovician acritarchs in the Meguma terrane, Nova Scotia, Canada: Resolution of early Paleozoic stratigraphy and implications for paleogeography

White¹,

Palacios²,

Jensen³

et al. 2012

Geological Society of America Bulletin

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Organic-walled microfossils (acritarchs) provide age constraints for the previously poorly dated Cambrian and Lower Ordovician turbiditic Goldenville and Halifax Groups in the northern AppalachianMeguma terrane of Nova Scotia and address controversies about stratigraphy and provenance. The oldest exposed formation of the ~8-km-thick Goldenville Group contains the trace fossil Oldhamia, which suggests an age of late Early Cambrian, whereas the coticule-bearing uppermost formation yielded an acritarch species consistent with Middle Cambrian (Epoch 3) age. The conformably overlying ~5-km-thick Halifax Group includes basal pyritiferous units that yielded a Late Cambrian (Furongian) assemblage of acritarch species, providing further confi rmation that the underlying manganese-bearing formations are of Cambrian Epoch 3 age, and not Ordovician as recently claimed. Overlying nonpyritiferous formations contain the Early Ordovician graptolite Rhabdinopora fl abelliformis fl abelliformis and acritarchs of similar age. Samples collected up section from the graptolite occurrence yielded acritarch species that are indicative of the later Tremadocian and Floian. The new fossil data confi rm a gap in age of ~30 m.y. between the Halifax Group and the overlying Silurian to Lower Devonian Rockville Notch Group. The new ages are consistent with stratigraphic units defi ned in regional mapping and support recent interpretation of fundamental differences in depositional and tectonic environments between the north western and southeastern parts of the Meguma terrane. They also pro-vide new constraints on paleogeography of the terrane by confi rming age similarities to stratigraphy in north Wales, with which correlation has been proposed previously based mainly on lithological similarities.

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Trace fossils from arenig flysch sediments of eire and their bearing on the early colonisation of the deep seas

Cited by 49 publications

References 28 publications

A diverse ichnofauna from Eocene‐Miocene rocks of the Makran Range (S.E. Iran)

A diverse ichnofauna from Eocene‐Miocene rocks of the Makran Range (S.E. Iran)

The ichnofauna of the Skiddaw Group (early Ordovician) of the Lake District, England

Cambrian-Ordovician acritarchs in the Meguma terrane, Nova Scotia, Canada: Resolution of early Paleozoic stratigraphy and implications for paleogeography

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